CW has several shows with short seasons. They were always intended to have short seasons. It has nothing to do with ratings.
WE GOT MOVIE SIIIIIGN!

You can't think of another reason ??? The show is CW's most expensive show to make. Hence fewer episodes are made.
Always remember Hollywood is run by 3 things : Greed, Fear, and Stupidity

and too awful too.

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Originals is premiering late this season so LOT could have it's thursday spot, so I think the intention was always to have it be a half season this year. I think LOT was brought back in fall instead of spring so they could do that 4 way crossover for November sweeps, I think.

doubt it because the effects look shoddy as hell, supergirl costs CW more to make actually
seems legends season 2 ratings are all time low number wise also the 8-49 demo is the lowest yet, arrows is horrid too. supergirl and the flash are on top

Didn't Season 1 of this consistently beat Arrow's ratings of the same year? The primary thing working against LoT is the cost of its production being higher than any other show on the network.
It's likely a number of things cast costs, special effects, being a critical failure. I'm ok with it though, here's hoping for a tighter written season 2.

I thought it was because of all the special effects and perhaps the larger cast.